Cathode ray tube with ITO layer and conductive ground strip

Abstract

A cathode ray tube (CRT) with enhanced electromagnetic wave shielding effect and antistatic without increased manufacturing cost. The CRT includes a panel with a screen, a funnel connected to the panel, having a cone portion and a neck portion, an electron gun inserted in the neck portion, a deflection yoke installed around the cone portion, an external conductive layer deposited on the external surface of the funnel, a transparent conductive layer deposited on the outer surface of the screen, having a resistance greater than 1×10 5 Ω/cm 2 and equal to or less than 9×10 5 Ω/cm 2 , and a conductive ground portion electrically connected to the external conductive layer and attached to the cone portion of the funnel, facing the deflection yoke, and extending toward the neck portion.

What is claimed is:  
     
       1. A cathode ray tube comprising: 
       a panel with a screen;  
       a funnel connected to the panel, having a cone portion and a neck portion;  
       an electron gun in the neck portion;  
       an implosion band located at a contact area between the panel and the funnel to prevent implosion of the cathode ray tube;  
       a deflection yoke installed around the cone portion;  
       an external electrically conductive layer disposed on an external surface of the cone portion;  
       an indium tin oxide layer disposed on an outer surface of the screen, electrically connected to the implosion band and to the external electrically conductive layer, and having a sheet resistivity greater than 1×10 5  Ω/cm 2  and not more than 9×10 5  Ω/cm 2 ; and  
       an electrically conductive ground portion strip comprising an insulating film and an electrically conductive adhesive layer on a surface of the insulating film, electrically connected to the external electrically conductive layer, attached to the cone and neck portions of the funnel, disposed between the cone portion of the funnel and the deflection yoke, and extending from the neck portion of the funnel to the cone portion.  
     
     
       2. The cathode ray tube of  claim 1 , wherein the electrically conductive adhesive layer is a mixture of graphite and acrylic adhesives. 
     
     
       3. The cathode ray tube of  claim 1 , wherein the electrically conductive adhesive layer includes an auxiliary conductive material. 
     
     
       4. The cathode ray tube of  claim 3 , wherein the auxiliary conductive material is nickel. 
     
     
       5. The cathode ray tube of  claim 1 , wherein the electrically conductive ground portion includes a metal layer located between the insulating layer and the electrically conductive adhesive layer. 
     
     
       6. A cathode ray tube comprising: 
       a panel with a screen;  
       a funnel connected to the panel, having a cone portion and a neck portion;  
       an electron gun in the neck portion;  
       an implosion band located at a contact area between the panel and the funnel to prevent implosion of the cathode ray tube;  
       a deflection yoke installed around the cone portion;  
       an external electrically conductive layer disposed on an external surface of the cone portion but not on the neck portion;  
       an indium tin oxide layer disposed on an outer surface of the screen, electrically connected to the implosion band and to the external electrically conductive layer, and having a sheet resistivity greater than 1×10 5  Ω/cm 2  and not more than 9×10 5  Ω/cm 2 ; and  
       an electrically conductive ground portion strip comprising an insulating film and an electrically conductive adhesive layer on a surface of the insulating film, electrically connected to the external electrically conductive layer, attached to the cone and neck portions of the funnel, disposed between the cone portion of the funnel and the deflection yoke, and extending from the neck portion of the funnel to the cone portion.  
     
     
       7. The cathode ray tube of  claim 6 , wherein the electrically conductive adhesive layer is a mixture of graphite and acrylic adhesives. 
     
     
       8. The cathode ray tube of  claim 6 , wherein the electrically conductive adhesive layer includes an auxiliary conductive material. 
     
     
       9. The cathode ray tube of  claim 8 , wherein the auxiliary conductive material is nickel. 
     
     
       10. The cathode ray tube of  claim 6 , wherein the electrically conductive ground portion includes a metal layer located between the insulating layer and the electrically conductive adhesive layer.